MEGA 960D PUMP OPERATION / MAINTENANCE MANUAL PAGE 17
4.7.b Body Disassembly
• Remove check bore caps using 3/4” pin tool and remove seals.
• Remove sleeves, balls, O-rings and check seat wear rings. Do not use
excessive force.
• Unthread push plate locking screw and push plate from the one side of the
shaft.
• Remove remaining shaft and push plate from body.
• Unthread second locking screw and push plate from shaft.
• Unthread shaft bushing locking screw from body.
• Using 2” pin tool, insert pins in shaft bushing locking ring located in the
master head side of chamber and rotate CCW to remove bushing. Then
push out bushing from the slave head chamber side.
4.8 ASSEMBLY
Prior to beginning assembly, inspect all parts to ensure they are clean and dry.
Wear clean protective gloves.
4.8.a Pilot Valve (Both Heads)
NOTE: Do not use any tools to install the pilot button. Use of tools may damage
the button.
• Remove existing pilot button and discard.
• Replacement pilot button should be tightened enough that the underside of
the head touches the pilot piston.
• No light should be visible between the bottom of the button head and the
piston.
Figure 4-1
• Slide seal onto pilot valve body until even engagement with the shoulder is
reached. The shoulder is located in the center of the pilot valve body.
• Thread the pilot valve assembly into the pilot bore of the head as shown in
Figure 4-2. Tighten to 25 in-lbs. Do not over tighten.
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